Marcus Smart hasn't reached a new deal with the Celtics a couple weeks into free agency, but there might be a reason behind that since talks between the two sides have reportedly been slow.

According to Yahoo Sports Insider Jordan Shultz, citing unidentified sources, Smart has been "unresponsive" to Boston's efforts to reach out as the Celtics have had "zero communication or contact with Smart." The report adds that Smart is "insulted by what he feels is a lack of respect by front office."

A source close to Marcus Smart says Smart has been “unresponsive” in #Celtics’ efforts to reach out because he is “insulted by what he feels is a lack of respect by front office.” https://t.co/aGVO4xiA6t

Yahoo Sports reports that Smart has garnered interest from the Grizzlies and Nets and has already met with Brooklyn. NBC Sports reported Monday that the Kings are also preparing an offer sheet.

What appears to be Boston Celtics restricted free agent Marcus Smart and his agent having a conversation with Brooklyn Nets general manager Sean Marks at the Thomas and Mack Center on Monday night. pic.twitter.com/04EaquaNxy

Smart, 24, entered this offseason as a restricted free agent after spending four seasons with the Celtics. The Boston Herald reported last week that Smart was hurt and frustrated that Boston general manager Danny Ainge had not reached out to him to discuss a multi-year deal.